Sickle-grinder.



PATENTED APR. 12, 1904.`

F. P. BURKHARDT. SIGKLE GRINDER.

APPLICATION FILED SEPT. 8.1902.

2 SHEETS-SHEET 1.

NO MODEL.

PATENTED APR. 12, v1904.`

LP. BURKHARDT. SIGKLE GRINDBR. APPLICATION FILED SEPT. 8, 1902.

2 SHEETS-SHEET 2.

N0 MODEL.

ING. 756,828.

UNTTED STATES Patented April 12, 1904.

PATENT OFFICE.

VVARDER, BUSHNELL 8a GLESSNER COMPANY, OF SPRINGFIELD, OHIO,

AND CHICAGO, ILLINOIS, A CORPORATION OF OHIO.

SlCKLE-GRINDER.

SPECIFICATION forming part of Letters Patent No. 756,828, dated April 12, 1904. Application filed September 8, 1902. Serial No. 122,485. (No model.)

T0 all whom. it may concern:

Be it known that I, FRANKLIN P. BURK- HARDT, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented anew and useful Improvement in Sickle-Grinders, of which the following is a specification.

This invention relates to sickle-grinders.

The object of the invention is to simplify and improve the construction of sickle-grinders and to render the same efficient in operation.

The invention consists, substantially, in the construction, combination, location, and arrangement of parts, all as will be more fully hereinafter set forth, as shown in the accompanying drawings, and finally pointed out in Ithe appended claims.

Referring to the accompanying drawings and to the various Views and reference-signs appearing-thereon, Figure 1 is a view in side elevation of a construction of sickle-grinder embodying the principles of myv invention. Fig. 2 is a top plan view of the same. Fig. 3 is a broken detail view in section on the line 3 8, Fig. 2, looking in the direction of the arrow. Fig. 4. is a detached detail view in front elevation of the work-holder. Fig. 5 is a broken detail view in section on the line 5 5 of Fig. 6 of a modified form of clamp employed in connection with the work-holder. Fig. 6 is a top plan view of the construction shown in Fig. 5.

The same part is designated by the same reference-sign wherever it occurs throughout the several views.

A designates a suitable framework upon which the various operating parts are mounted and provided with suitable clamping-jaws B C for clamping the same upon a bench or other suitable support. It is obvious, however, that the framework may be clamped or supported in any suitable, simple, or wellknown manner, and the particular manner of mounting and clamping the same forms no part of my invention. In framework A is journaled a shaft D, upon which is sleeved a vibrating frame E. A shaft F is journaled in said vibrating frame and has mounted thereon in any suitable or convenient manner the grinder G.

H designates a drive-shaft journaled in main frame A and adapted to receive rotation in any suitable or convenient manner-"as, for instance, by means of the crank-handle .I and transmitting rapid rotary movement to the grinder-shaft F and grinderGin any suitable or convenient manner-das, for instance, through the train of gearing indicated at K.

Suitably connected to vibrating frame E is a yoke L, arranged to receive therein a cam M, mounted on shaft D, whereby when said cam is rotated said frame E is vibrated about its sleeved supports upon shaft D. The elevation of frame E and the limits of its vibration may be adjustably regulated in any suitable manner. I have shown a simple and convenient arrangement for accomplishing this object, wherein the yoke L is provided with a heel or extension N, arranged to engage a pin O, adapted to be received in one of a series of holes P, formed in an arm or bracket Q, carried by or forming part of the main framework A; By inserting the pin O in any one of said holes the position of frame E may be adjustably regulated. Mounted upon shaft D isa gear R, arranged to mesh with and to be driven from a pinion S, mounted on driveshaft H. Except for the -rotation imparted to shaft D through intermeshing gears S and R said shaft does not have rotative movement. The one or the other of intermeshing pinion and gear S and R is adapted to be detachably connected to rotate with the shaft upon which it is mounted. For instance, in the particular form shown the pinion S is adapted to be connected by a Cotter-pin or otherwise in any suitable or convenient manner to rotate with drive-shaftI-I and when so connected to impart rotation through gear R to shaft D, and hence also to cam M, thereby imparting a vibratory movement to frame E,

and hence also to the grinder, and by detaching said pinion S no vibration will be imparted to said frame E.

I will now describe the work-holder employed in connection with my invention.

A' designates the holder-frame, pivotally supported, as at B', upon frame A and provided with hook-shaped arms C' D', suitably spaced and arranged to receive the cutter or knife bar or other tool to be sharpened or ground. In order to eiiiciently clamp the work in the holder, I employ a set-screw E', tapped through a bearing F', carried by the holder-frame A', and arranged in position for the end of said set-screw to bear against the body of the knife or cutter bar and preferably in a vertically downwardly inclined direction, as clearly illustrated in the drawings, the tension of said screw being exerted to press the work downwardly and outwardly against the actuating ends of arms C' and D', thereby eiiiciently clamping the work in place. The hinged connection of holder-frame A' permits said frame to be rocked or swung in one direction or the other tocarry the work into position to be operated on by the grinder or away from the range of movement of the grinder for removal or replacement of th@ work. If desired, the work-holder may be yieldingly held in: rocked or swung position toward the grinder-as, for instance, by means of a tension-spring Gr', connected at the ends thereof to the work-holder frame and to the main frame A, respectively. The range of movement of the work-holder toward the path of action of the grinder may be adjustably limited in any suitable manner-as.` for instance, bymeans of a tail projection H' of said holder-frame, through which is tapped a setscrew J', arranged to b ear against a convenient stationary part of the main frame A, as clearly shown in Fig. l.

It will be observed that the xed part of the frame and the work-holder frame are in such relation as to be carried past a line passing through the hinging axis of the work-holder and the point of connection of the spring to the fixed frame when said work holder is rocked or swung into position to present the work to' the grinder and also when rocked downward and away from the grinder. By thus passing this dead-center line it will be seen that the work-holder frame is yieldingly held in whichever position it occupies.

In Figs. 5 and 6 I have shown a slightlymodified arrangement of clamping set-screw for the work, wherein the clamping set-screw E2 is tapped through a block or yoke A2, arranged to embrace lug or projection F2, said set-screw E2 passing through an opening in said lug or projection F2. As shown, said opening' is enlarged and is tapering in opposite directions, as indicated at B2C, (see Fig. 5,) thereby permitting a rocking movement of clamping set-screw E2, so as to automatically adjust itselfv to proper bearing relation with respect to the work to be clamped.and to facilitate such rocking movement of the clamping set-screw the bearing-surface of yoke A2 may be rounded ofi", as indicated at D2.

It is believed that the operation of the apparatus will be fully understood from the foregoing description.

It is obvious that many variations and changes in the details of construction and arrangement would readily occur to persons skilled in the art and still fall within the spirit and scope of my invention. I do not desire, therefore, to be limited or restricted to the exact details of construction and arrangement shown and described; but, i

Having now set forth the object and nature of my invention and a construction embodying the principles thereof, what I claim as new and useful and of my own invention, and desire to secure by Letters Patent, is*

l. In a sickle grinder, a main frame, a grinder-frame pivotally mounted therein, a drive-shaft arranged out of line with the axis upon which the grinder-frame is pivoted, a cam mounted on the pivotal axis of the grinderframe, a grinder mounted in said grinderframe, gearing actuated by said drive-shaft for rotating said grinder, and gearing also actuated by said drive-shaft for rotating said cam, said cam arranged to engage said grinderframe, whereby vibratory movements are imparted to said frame, as and for the purpose set forth.

2. In a sickle-grinder, a main frame, a shaft mounted therein, a grinder-frame journaled upon said shaft, acam mounted upon said shaft and arranged to engage said grinder-frame, and an independent drive-shaft, and gearing actuated by said drive-shaft for rotating said grinder, and detachable gearing also actuated by said drive-shaft for rotating said cam, as and for the purpose set forth.

3. In a sickle grinder, a main frame, a grinder-frame pivotally mounted thereon and carrying a grinder, a drive-shaft journaled in said main frame and independent of the pivotal axis of. said grinder-frame, gearing actuated by said drive shaft for driving said grinder, a cam journaled upon the axis of pivotal mount of said grinder-frame and arranged p to engage the latter, gearing intermediate said cam and drive-shaft for rotating the former, and means for vertically adjusting the position of the grinder-frame, as and for the purpose set forth.

4L. In a sickle-grinder, a main frame provided with an extension, said extensionvhaving a series of holes therein, a grinder-frame pivotally supported upon said main frame and having an extension beyond its point of pivotal connectionl to said main frame, a pin adapted to be mounted in any one of the holes IOO IIO

in the extension of said main frame and arranged to engage said grinder-frame extension to adjustably regulate the position of said grinderframe, a grinder mounted in said grinder-frame, and gearing for rotating the same, as and for the purpose set forth.

In a sickle-grinder, a main frame, a shaft mounted therein, a grinder, a supportingframe therefor, said grinder-frame being journaled to swing upon said shaft, a yoke carried by said grinder-frame, a cam mounted upon said pivot-shaft and arranged to engage said yoke, a drive-shaft journaled in said main frame, intermeshing gears respectively mounted upon said drive and pivot shafts, whereby said cam is driven from said drive-shaft, and a train of gearing actuated by said drive-shaft for rotating said grinder, as and for the purpose set forth.

6. In a sickle-grinder, a main frame, a shaft mounted therein, a grinder, a supportingframe therefor, said supporting-frame mounted to rock or swing upon said shaft, said main frame provided with an extension beyond said shaft, a drive-shaft journaled in said extension, a cam mounted upon said pivot-shaft and arrang'ed to engage said grinder-frame, gearing actuated by said drive-shaft for rotating said cam, and a train of gearing also actuated by said drive-shaft for rotating the grinder, and means for adjusting the position of said grinder-frame with reference to said pivotshaft, as and for the purpose set forth.

7. In a machine of the class described, a grinder and means for operating the same, in combination with a work-holder comprising a holder-frame, a clamping device carried thereby, and a tension device operating to hold said frame pressed toward the grinder, and also, when sufficiently rocked, away from said grinder, as and for the purpose set forth.

8. In a machine of the class described, a sickle-grinder and means for operating the same, in combination with a work-holder comprisinga pivotally-mounted frame, means for yieldingly drawing said frame into position ,for the work to be engaged by the grinder',

said means also operating to hold said frame away from the grinder when sufficiently rocked, and means for adj ustably limiting the extent of movement of said frame toward the path of operation of the grinder; as and for the purpose set forth.

9. The combination with a frame, a grinder mounted therein, means for actuating the same, a pivoted work-holder, aspring respectively connected to said frame and holder and so relatively arranged that when said holder is rocked the point of connection of said spring thereto passes the dead-center line of pull of said spring, as and for the purpose set forth.

10. In a machine of the class described, a sickle-grinder and means for operating the same, in combination with a work-holder comprising a clamping set-screw, a frame through which said set-screw is tapped, said frame arranged to be swivelly supported to permit angular adjustment of said set-screw, as and for the purpose set forth. i

l1. In a sickle-grinder, a main frame, a grinder-frame pivotally mounted therein, a drive-shaft arranged out of line with the axis upon which the grinder-frame is pivoted, a cam mounted on the pivotal aXis of the grinderframe, a grinder mounted in said grinderframe,gearing actuated by said drive-shaft for rotating said grinder,and independent gearing also actuated by said drive-shaft for rotating said cam, said cam arranged to engage said grinder-frame, whereby vibratory movements are imparted to said frame, as and for the purpose set forth.

In witness whereof I have hereunto set my hand, this 4th day of September, 1902, in the presence of the subscribing witnesses.

FRANKLIN I. BURKHARDT.

Witnesses:

A. L. SPRINKLE, E. H. KIMBARK. 

